ilxu1a reported a flaw in Mozilla's implementation of typed array
bounds checking in JavaScript just-in-time compilation (JIT) and its
management of bounds checking for heap access. This flaw can be
leveraged into the reading and writing of memory allowing for
arbitary code execution on the local system.

Mariusz Mlynski discovered a method to run arbitrary scripts in a
privileged context. This bypassed the same-origin policy protections
by using a flaw in the processing of SVG format content navigation.

For the stable distribution (wheezy), these problems have been fixed in
version 31.5.3esr-1~deb7u1.

For the unstable distribution (sid), these problems have been fixed in
version 31.5.3esr-1.